I have one primarily to protect the original edge on the 72" OEM bucket. It is very, very tough. The Piranah is not my primary digging bucket, but I have used it extensively digging out some large rocks from very dense clay while creating my driveway. The cutting edges have some wear and dings, but I am surprised at how good they still look from the very hard usage I have given them. A grinder can fix most of the edges should I feel a need in the future but am not at that point yet and probably will not get there either as my hard digging is mostly completed.
The Piranah has been banged, frammed, skidded across/into large granite rocks many more times then I can count when I should have taken the time to change to a narrower, better digging grapple bucket or stump bucket instead. I sincerely doubt any tractor less than 7000 pounds weight has worked a bucket any harder than I have, as more often than not my front wheels are in the air putting down pressure while digging rocks up to 2000 pounds buried ~ 95%. But the Piranah has only been dealing with smaller rocks in the few hundred pound range.
It is a great bang for the buck.